Can a broken car crankshaft position sensor cause a car stoppage?

Hello! Generally, after the crankshaft position sensor of the vehicle is damaged, the vehicle will not start.

If the signal is not accurate, there may be shaking after the vehicle starts, and the frustration is generally not the problem of the crankshaft position sensor.

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The crankshaft position sensor controls the ignition time of the car. If there is a deviation in the ignition timing after the failure, it will fail to start or the timing will not shake the engine after starting, and the power will decrease, which will cause the engine to fail to start in serious cases.

How the crankshaft position sensor works:

There are three main types: magnetoelectric induction, Hall effect, and photoelectric. The three types work on the following principles:

1. Magnetoelectric induction:

The magnetoelectric inductive speed sensor and the crankshaft position sensor are installed in the distributor in two layers. The sensor consists of a permanent magnet induction detection coil and a rotor (timing rotor and speed rotor) that rotates with the distributor shaft. Timing rotor has.

One, two, or four teeth, etc., the speed rotor is 24 teeth. The permanent magnet induction detection coil is fixed on the distributor body. If the speed sensor signal and the crankshaft position sensor signal are known, as well as the working sequence of each cylinder, the crankshaft position of each cylinder can be known.

Rotor signal panels for magnetoelectric inductive speed sensors and crankshaft position sensors can also be mounted on crankshafts or camshafts.

2. Hall effect:

Hall-effect speed sensors and crankshaft position sensors are signal generators that utilize the Hall effect. The Hall signal generator is installed in the distributor, coaxial with the distributor head, and is fixed on the distributor panel by the encapsulated Hall chip and a permanent magnet. The number of notches on the trigger impeller is the same as the number of engine cylinders.

When the blade on the trigger impeller enters between the permanent magnet and the Hall element, the magnetic field of the Hall trigger is bypassed by the blade, and the Hall voltage is not generated, and the sensor has no output signal; When the notched part on the trigger impeller enters between the permanent magnet and the Hall element, the magnetic field lines enter the Hall element, the Hall voltage rises, and the sensor outputs a voltage signal.

3. Photoelectric type:

Photoelectric crankshaft position sensors are generally installed in distributors and consist of a signal generator and a signal disc with light holes. The signal panel rotates together with the distributor shaft photoelectric type, and there are 360 lithography gaps in the outer ring of the signal panel, which produces a signal with a crankshaft rotation angle of 1 °; Slightly inward, there are 6 orifices evenly spaced 60 ° apart, generating a signal of a 120° angle of rotation of the crankshaft, one of which is wider to generate a signal relative to the top dead center of the 1st cylinder. The signal generator is mounted on a distributor housing and consists of two light-emitting diodes, two photodiodes and a circuit.

The light-emitting diode is facing the photodiode. The signal disk is located between the light-emitting diode and the photodiode, and because there is a light hole on the signal disk, the phenomenon of alternating light transmission and shading occurs. When the beam of the light-emitting diode hits the photodiode, the photodiode generates a voltage; When the LED beam is blocked, the photodiode voltage is 0.

These voltage signals are amplified by the partial shaping of the circuit and are transmitted to the electronic control unit (ECU) at 1° and 120° crankshaft rotation angles, which calculates the engine speed and crankshaft position based on these signals.

Crankshaft position sensors are usually installed in distributors and are one of the most important sensors in control systems. Its functions are: detecting engine speed, so it is also called speed sensor; Detecting the position of the piston top dead center, so it is also called an top dead center sensor, which includes the detection of the top dead center signal of each cylinder used to control the ignition, and the top dead center signal of the first cylinder used to control the sequential fuel injection.

The four major types of faults are: maximum fault, when the signal exceeds the upper limit of the normal range. Minimal failure, the signal exceeds the lower limit of the normal range.

The role of the crankshaft position sensor is to determine the position of the crankshaft, i.e. the angle of the crankshaft and the engine speed. It usually works in conjunction with a camshaft position sensor – to determine the basic ignition moment. We all know that the engine starts igniting at the end of the compression stroke, so how does the engine computer know which cylinder is due to ignite?

It is calculated by the signal of the crankshaft position sensor and the camshaft position sensor, through the crankshaft position sensor, you can know which cylinder piston is at the top dead center, and through the camshaft position sensor, you can know which cylinder piston is in the compression stroke. In this way, the engine computer knows which cylinder to fire when to fire.

If the crankshaft position sensor is good, the angle of the crankshaft can not be confirmed, the engine computer can not receive the signal of the crankshaft position sensor, in order to protect the engine will not ignite, no fuel injection, the car shows signs that there is no high voltage, no fuel injection, no car.

The role of the crankshaft position sensor determines the position of the crankshaft, that is, the angle of rotation of the crankshaft. It usually works in conjunction with a camshaft position sensor – to determine the basic ignition moment.

The English abbreviation of crankshaft position sensor is CKPS or CKP, also known as engine speed sensor, most of which use magnetic inductive sensors, with 60 teeth minus 3 teeth or 60 teeth minus 2 teeth target wheel.

The English reduced CMPS or CMP, also known as Hall sensor, mostly uses Hall sensor, with a signal rotor with 1 notch or several unequal notches.

The control unit constantly receives and compares the voltages of these two signals, and when the two signals are at low potential, the control unit thinks that at this time, it can reach the top dead center of the compression stroke of the 1 cylinder after a certain crankshaft angle. If the CKP and CMP are both at low potential, the control unit has a reference for the ignition timing and the injection time.

This sensor is mainly used to transmit engine speed information, if it is broken, there will be no idling, and the engine will not start without idling. Highly recommend replacement!

ECM ignition system according to the crankshaft position signal to achieve ignition, if there is no signal at all, the engine will not be able to start, the situation is not good, the engine may be easy to ignite, shake, weakness and other phenomena with a wave tester can clearly observe the waveform! If it does occur, it is recommended to replace it if it is good or bad (signal inaccuracy).

His main role is to control the ignition time and cylinder combustion. and control of the timing and volume of fuel injection. Acquire signals for camshafts

The automotive crankshaft position sensor is a signal source for effective control of the engine; If the engine is damaged, it will not receive the signal from the crankshaft position sensor and will not ignite, resulting in the engine failure light on the dashboard will be illuminated.

This sensor can detect the engine speed to better control the fuel injection, which can lead to power loss or knocking.

If the crankshaft position sensor is damaged, the engine control unit cannot receive a reference signal at start-up, and the ignition coil does not generate high voltage. After 2s of turning on the ignition switch, if the engine is not started, the engine control unit will cut off the control voltage to the fuel pump relay and stop supplying power to the fuel pump and ignition coil, resulting in the vehicle being unable to start.

The function of the crankshaft position sensor is to determine the position of the crankshaft, i.e. the angle of rotation of the crankshaft. It usually works in conjunction with a camshaft position sensor – to determine the basic ignition moment.

If the crankshaft position sensor is damaged, the angle of the crankshaft cannot be confirmed. The engine computer can't receive the signal from the crankshaft position sensor, so in order to protect the engine, it will not ignite or inject fuel, and the signs shown by the car are that there is no high-voltage electricity, no fuel injection, and no driving force.

How the crankshaft position sensor works:

Crankshaft sensors mainly include magnetoelectric induction, Hall effect and photoelectric type. The crankshaft position sensor is usually installed at the front end of the crankshaft (at the pulley) and the rear end of the crankshaft near the large flywheel or in the middle of the crankshaft.

Its function is to detect the engine speed, so it is also called a speed sensor; Detecting the position of the piston top dead center, so it is also called an top dead center sensor, which includes the detection of the top dead center signal of each cylinder used to control the ignition, and the top dead center signal of the first cylinder used to control the sequential fuel injection.

Summary. Hello, the symptoms of a broken car crankshaft sensor are: 1. The fault light is lit 2. The engine can rely on the camshaft position sensor to continue to work, but the starting time may be relatively long, and the cruise and exhaust braking systems can not work normally, and there will be engine shake and white smoke, but the power performance has not changed significantly, and the throttle responds normally.

Because the crankshaft sensor is broken, the rotation angle of the crankshaft will not be determined, and the engine computer will not receive the data of the crankshaft sensor.

Hello, the symptoms of a broken car crankshaft sensor are: 1. The fault light is lit 2. The engine can be stopped to rely on the camshaft position sensor to continue to work, but the starting time may be relatively long, and the cruise and exhaust braking systems can not work normally, and there will be engine shaking, white smoke, virtual but no obvious change in power performance, and the throttle response is normal. Because the crankshaft sensor is broken, the rotation angle of the crankshaft will not be determined, and the engine computer will not receive the data of the crankshaft sensor.

Reading the fault code with the decoder said that it was a failure of the crankshaft position sensor, but I changed the sensor and still couldn't hit the car.

Hello, use the decoder to read the fault code and say that it is the crankshaft position sensor failure, but if the sensor is replaced or the front reed can not hit the car, you can see whether the gasoline pump is injected, there is no high-pressure fire is the fault of the ignition hole before the ignition hole, if the ignition coil does not have a 12 volt voltage input, this is caused by the failure of the gasoline pump.